The campaign against this mosque is one of the ugliest and most odious controversies in some time. It's based purely on appeals to base fear and bigotry. There are no reasonable arguments against it, and the precedent that would be set if its construction were prevented -- equating Islam with Terrorism, implying 9/11 guilt for Muslims generally, imposing serious restrictions on core religious liberty -- are quite serious. It was Michael Bloomberg who first stood up and eloquently condemned this anti-mosque campaign for what it is, but Obama's choice to lend his voice to a vital and noble cause is a rare demonstration of principled, politically risky leadership. It's not merely a symbolic gesture, but also an important substantive stand against something quite ugly and wrong. This is an act that deserves pure praise.